Abstract: Investigation of Xray ring aperture coded imaging technique is performed aimed at the application of inertial confinement fusion research. The autocorrelations function of a ring aperture is calculated numerically. The effect of the function on the image reconstruction in the coded imaging is analyzed. A primary comparison of different image reconstruction treatment is gaven. Ring aperture coded imaging could have a better spatial resolution than the width of the ring with deconvolution reconstruction technique. Experimental demonstration of laser plasma Xray ring aperture coded imaging is performed on the Xingguang II facility and content results are obtained.